是否可以对 ES6 地图对象进行排序? [英] Is it possible to sort a ES6 map object?

问题描述

是否可以对 es6 地图对象的条目进行排序?

Is it possible to sort the entries of a es6 map object?

var map = new Map();
map.set('2-1', foo);
map.set('0-1', bar);

结果:

map.entries = {
    0: {"2-1", foo },
    1: {"0-1", bar }
}

是否可以根据键对条目进行排序?

Is it possible to sort the entries based on their keys?

map.entries = {
    0: {"0-1", bar },
    1: {"2-1", foo }
}

推荐答案

根据 MDN 文档:

Map 对象按插入顺序迭代其元素.

A Map object iterates its elements in insertion order.

你可以这样做:

var map = new Map();
map.set('2-1', "foo");
map.set('0-1', "bar");
map.set('3-1', "baz");

var mapAsc = new Map([...map.entries()].sort());

console.log(mapAsc)

使用.sort()，记住数组是根据每个字符的Unicode码位值排序的，根据每个元素的字符串转换.所以 2-1, 0-1, 3-1 会被正确排序.

Using .sort(), remember that the array is sorted according to each character's Unicode code point value, according to the string conversion of each element. So 2-1, 0-1, 3-1 will be sorted correctly.

这篇关于是否可以对 ES6 地图对象进行排序?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！